/**
 * Copyright (C) 2017-2018 Christian Pierre MOMON <cmomon@april.org>
 * Copyright (C) 2011-2013 Nicolas Vinot <aeris@imirhil.fr>
 *
 * This file is part of (April) Hebdobot.
 *
 * Hebdobot is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Hebdobot is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Hebdobot.  If not, see <http://www.gnu.org/licenses/>
 */
package org.april.hebdobot.pastebin;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.util.LinkedList;
import java.util.List;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.april.hebdobot.HebdobotException;

/**
 * The Class PastebinClient.
 */
public class PastebinClient
{
    private static final String API_LOGIN_URL = "https://pastebin.com/api/api_login.php";
    private static final String API_POST_URL = "https://pastebin.com/api/api_post.php";

    private static final String API_DEV_KEY = "api_dev_key";
    private static final String API_USER_KEY = "api_user_key";
    private static final String API_USER_NAME = "api_user_name";
    private static final String API_USER_PASSWORD = "api_user_password";
    private static final String API_OPTION = "api_option";
    private static final String API_PASTE_PRIVATE = "api_paste_private";
    private static final String API_PASTE_NAME = "api_paste_name";
    private static final String API_PASTE_EXPIRATION = "api_paste_expire_date";
    private static final String API_PASTE_FORMAT = "api_paste_format";
    private static final String API_PASTE_CODE = "api_paste_code";
    public static final String API_ERROR = "Bad API request,";

    private String apiKey;
    private String apiUserKey;
    private HttpClient httpClient;

    /**
     * Instantiates a new pastebin client.
     *
     * @param apiKey
     *            the api key
     */
    public PastebinClient(final String apiKey)
    {
        this.apiKey = apiKey;
        this.httpClient = new DefaultHttpClient();
    }

    /**
     * Login.
     *
     * @param name
     *            the name
     * @param password
     *            the password
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public void login(final String name, final String password) throws HebdobotException
    {
        try
        {
            final List<NameValuePair> params = new LinkedList<>();
            setParameter(params, API_DEV_KEY, this.apiKey);
            setParameter(params, API_USER_NAME, name);
            setParameter(params, API_USER_PASSWORD, password);

            final HttpPost request = new HttpPost(API_LOGIN_URL);
            request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));

            final HttpResponse response = this.httpClient.execute(request);
            final String content = IOUtils.toString(response.getEntity().getContent(), StandardCharsets.UTF_8);
            APIException.throwIfError(content);
            this.apiUserKey = content;
        }
        catch (UnsupportedEncodingException exception)
        {
            throw new HebdobotException(exception);
        }
        catch (ClientProtocolException exception)
        {
            throw new HebdobotException(exception);
        }
        catch (IOException exception)
        {
            throw new HebdobotException(exception);
        }
        catch (APIException exception)
        {
            throw new HebdobotException(exception);
        }
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code) throws HebdobotException
    {
        String result;

        result = this.paste(code, null, Format.NONE, Private.PUBLIC, Expiration.DAY_1);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param expiration
     *            the expiration
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final Expiration expiration) throws HebdobotException
    {
        String result;

        result = this.paste(code, null, Format.NONE, Private.PUBLIC, expiration);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param format
     *            the format
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final Format format) throws HebdobotException
    {
        String result;

        result = this.paste(code, null, format, Private.PUBLIC, Expiration.DAY_1);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param format
     *            the format
     * @param expiration
     *            the expiration
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final Format format, final Expiration expiration) throws HebdobotException
    {
        String result;

        result = this.paste(code, null, format, Private.PUBLIC, expiration);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param format
     *            the format
     * @param privat
     *            the privat
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final Format format, final Private privat) throws HebdobotException
    {
        String result;

        result = this.paste(code, null, format, privat, Expiration.DAY_1);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param format
     *            the format
     * @param privat
     *            the privat
     * @param expiration
     *            the expiration
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final Format format, final Private privat, final Expiration expiration) throws HebdobotException
    {
        String result;

        result = this.paste(code, null, format, privat, expiration);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param privat
     *            the privat
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final Private privat) throws HebdobotException
    {
        String result;

        result = this.paste(code, null, Format.NONE, privat, Expiration.DAY_1);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param privat
     *            the privat
     * @param expiration
     *            the expiration
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final Private privat, final Expiration expiration) throws HebdobotException
    {
        String result;

        result = this.paste(code, null, Format.NONE, privat, expiration);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param name
     *            the name
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final String name) throws HebdobotException
    {
        String result;

        result = this.paste(code, name, Format.NONE, Private.PUBLIC, Expiration.DAY_1);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param name
     *            the name
     * @param format
     *            the format
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final String name, final Format format) throws HebdobotException
    {
        String result;

        result = this.paste(code, name, format, Private.PUBLIC, Expiration.DAY_1);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param name
     *            the name
     * @param format
     *            the format
     * @param expiration
     *            the expiration
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final String name, final Format format, final Expiration expiration) throws HebdobotException
    {
        String result;

        result = this.paste(code, name, format, Private.PUBLIC, expiration);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param name
     *            the name
     * @param format
     *            the format
     * @param privat
     *            the privat
     * @return the string
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final String name, final Format format, final Private privat) throws HebdobotException
    {
        String result;

        result = this.paste(code, name, format, privat, Expiration.DAY_1);

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param name
     *            the name
     * @param format
     *            the format
     * @param privat
     *            the privat
     * @param expiration
     *            the expiration
     * @return the pastebin URL
     * @throws HebdobotException
     *             the exception
     */
    public String paste(final String code, final String name, final Format format, final Private privat, final Expiration expiration)
            throws HebdobotException
    {
        String result;

        try
        {
            List<NameValuePair> params = new LinkedList<>();
            setParameter(params, API_DEV_KEY, this.apiKey);
            setParameter(params, API_USER_KEY, this.apiUserKey);
            setParameter(params, API_OPTION, Option.PASTE.getValue());
            setParameter(params, API_PASTE_PRIVATE, privat.getValue());
            setParameter(params, API_PASTE_NAME, name);
            setParameter(params, API_PASTE_EXPIRATION, expiration.getValue());
            setParameter(params, API_PASTE_FORMAT, format.getValue());
            setParameter(params, API_PASTE_CODE, code);

            final HttpPost request = new HttpPost(API_POST_URL);
            request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));

            final HttpResponse response = this.httpClient.execute(request);
            result = IOUtils.toString(response.getEntity().getContent(), StandardCharsets.UTF_8);
            APIException.throwIfError(result);
        }
        catch (UnsupportedEncodingException exception)
        {
            throw new HebdobotException(exception);
        }
        catch (ClientProtocolException exception)
        {
            throw new HebdobotException(exception);
        }
        catch (IOException exception)
        {
            throw new HebdobotException(exception);
        }
        catch (APIException exception)
        {
            throw new HebdobotException(exception);
        }

        //
        return result;
    }

    /**
     * Paste.
     *
     * @param code
     *            the code
     * @param name
     *            the name
     * @param privat
     *            the privat
     * @return the pastebin URL
     * @throws HebdobotException
     *             the hebdobot exception
     */
    public String paste(final String code, final String name, final Private privat) throws HebdobotException
    {
        String result;

        result = this.paste(code, name, Format.NONE, privat, Expiration.DAY_1);

        //
        return result;
    }

    /**
     * Sets the parameter.
     *
     * @param params
     *            the params
     * @param name
     *            the name
     * @param value
     *            the value
     */
    private static void setParameter(final List<NameValuePair> params, final String name, final String value)
    {
        if (value != null)
        {
            params.add(new BasicNameValuePair(name, value));
        }
    }
}